Yep, that's data usage becase you're streaming audio in that case. Basically any time you connect to anything else using your phone (except normal telephone calls using the dialer), you're using data. If you're on a wifi connection, you won't use your data package though.

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Thanks for your help, that explains why I have blown through my data plan, because I have been listening to the same podcast and not downloading it ahead of time. If I download it ahead of time at home (meaning wi-fi), then the data doesn't get cut into and I can listen to it while driving and not use data, right?

Well, I am using the one that is built into the iPhone 4S, not Google Earth/Maps or any other app that could be out there.

Everytime the built in map app refreshes itself (which normally happens as you move), you will be using data.

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